The Tokyo Metropolitan Government announced on April 24, 2026, a significant expansion of its seasonal dress code policy, officially encouraging public servants to wear shorts to work. This directive aims to mitigate the impact of rising energy costs and potential electricity shortages as the summer season approaches. The policy change is a direct response to the energy supply disruptions caused by the ongoing conflict involving the United States, Israel, and Iran, which has severely impacted global oil markets and Japan’s domestic fuel reserves.
Under the new guidelines, thousands of municipal employees are authorized to dispense with traditional business attire, including suits and trousers, in favor of more breathable clothing. By allowing staff to wear shorts, officials intend to set thermostats in government buildings to higher temperatures, thereby reducing the load on the regional power grid. This measure builds upon the Cool Biz campaign, an energy-saving initiative first introduced by Japan’s Ministry of the Environment in 2005 under then-Prime Minister Junichiro Koizumi. While the original campaign popularized the removal of neckties and jackets, the inclusion of shorts represents the most radical shift in Japanese bureaucratic dress standards to date.
The geopolitical context for this decision is rooted in the escalating hostilities in the Middle East. Japan, which imports approximately 90 percent of its crude oil from the region, has faced mounting pressure on its energy security since the outbreak of the US-Israel war on Iran. Reports from the Ministry of Economy, Trade and Industry (METI) indicate that shortages of petroleum products, including jet fuel and heavy oil, have become increasingly acute. The Japanese government has been forced to implement various conservation measures to maintain industrial output and essential services.
Tokyo officials stated that the adoption of shorts is part of a broader strategy to achieve a significant reduction in peak-load electricity demand. During the 2025 summer season, Tokyo experienced record-breaking temperatures, and meteorologists predict similar conditions for 2026. The metropolitan government’s decision serves as a signal to the private sector to adopt similar flexibility. Historically, Japan has utilized such soft conservation measures to avoid the mandatory rolling blackouts seen during previous energy crises, such as the period following the 2011 Great East Japan Earthquake.
As of April 24, the policy is set to remain in effect through September. The Ministry of the Environment is expected to monitor the energy savings achieved through this initiative to determine if similar mandates should be applied to national government offices in the coming weeks.